FMDERIVE Slow with Call Transaction

HI Everyone,

I am calling FMDERIVE using call Transaction but it is very very slow.

Can anyone advise on how to improve the speed>

Here is an extraxt of my code:

CALL TRANSACTION C_TCODE USING i_bdc_tab MODE z_ctm

update 'S' MESSAGES INTO i_msg_tab.

Here C_TCODE = FMDERIVER

i_bdc_tab is:

• Batch input data for call transaction

data: begin of i_BDC_TAB occurs 0.

include structure BDCDATA.

data: end of i_BDC_TAB.

I will appreciate your help